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(*
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* IBX For Lazarus (Firebird Express)
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*
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* The contents of this file are subject to the Initial Developer's
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* Public License Version 1.0 (the "License"); you may not use this
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* file except in compliance with the License. You may obtain a copy
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* of the License here:
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*
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* http://www.firebirdsql.org/index.php?op=doc&id=idpl
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Initial Developer of the Original Code is Tony Whyman.
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*
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* The Original Code is (C) 2015 Tony Whyman, MWA Software
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* (http://www.mwasoftware.co.uk).
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*
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* All Rights Reserved.
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*
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* Contributor(s): ______________________________________.
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*
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*)
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unit IBLookupComboEditBox;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, SysUtils, LResources, Forms, Controls, Graphics, Dialogs, DbCtrls,
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ExtCtrls, IBSQLParser, DB, StdCtrls, IBCustomDataSet;
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type
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{TIBLookupComboEditBox is a TDBLookupComboBox descendent that implements "autocomplete"
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of typed in text and "autoinsert" of new entries. Autocomplete uses SQL manipulation
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to revise the available list and restrict it to items that are prefixed by the
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typed text (either case sensitive or case insenstive). Autoinsert allows a
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newly typed entry to be added to the list dataset and included in the available
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list items. }
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TAutoInsert = procedure(Sender: TObject; aText: string; var NewKeyValue: variant) of object;
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TCanAutoInsert = procedure (Sender: TObject; aText: string; var Accept: boolean) of object;
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TIBLookupComboEditBox = class;
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{ TIBLookupComboDataLink }
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TIBLookupComboDataLink = class(TDataLink)
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private
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FOwner: TIBLookupComboEditBox;
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protected
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procedure ActiveChanged; override;
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procedure RecordChanged(Field: TField); override;
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procedure UpdateData; override;
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public
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constructor Create(AOwner: TIBLookupComboEditBox);
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end;
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{ TIBLookupControlLink }
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TIBLookupControlLink = class(TIBControlLink)
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private
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FOwner: TIBLookupComboEditBox;
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protected
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procedure UpdateSQL(Sender: TObject); override;
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public
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constructor Create(AOwner: TIBLookupComboEditBox);
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end;
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{ TIBLookupComboEditBox }
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TIBLookupComboEditBox = class(TDBLookupComboBox)
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private
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FCanAutoInsert: TCanAutoInsert;
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{ Private declarations }
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FDataLink: TIBLookupComboDataLink;
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FIBLookupControlLink: TIBLookupControlLink;
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FAutoComplete: boolean;
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FAutoInsert: boolean;
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FKeyPressInterval: integer;
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FOnCanAutoInsert: TCanAutoInsert;
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FRelationName: string;
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FTimer: TTimer;
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FFiltered: boolean;
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FOnAutoInsert: TAutoInsert;
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FOriginalTextValue: string;
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FUpdating: boolean;
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FInserting: boolean;
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FExiting: boolean;
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FLastKeyValue: variant;
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procedure DoActiveChanged(Data: PtrInt);
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function GetAutoCompleteText: TComboBoxAutoCompleteText;
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function GetListSource: TDataSource;
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function GetRelationNameQualifier: string;
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procedure HandleTimer(Sender: TObject);
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procedure IBControlLinkChanged;
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procedure ResetParser;
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procedure RecordChanged(Sender: TObject; aField: TField);
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procedure SetAutoCompleteText(AValue: TComboBoxAutoCompleteText);
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procedure SetListSource(AValue: TDataSource);
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procedure UpdateList;
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procedure UpdateSQL(Sender: TObject; Parser: TSelectSQLParser);
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procedure HandleEnter(Data: PtrInt);
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procedure UpdateLinkData(Sender: TObject);
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protected
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{ Protected declarations }
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procedure ActiveChanged(Sender: TObject);
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procedure CheckAndInsert;
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procedure DoEnter; override;
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procedure DoExit; override;
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procedure KeyUp(var Key: Word; Shift: TShiftState); override;
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procedure Loaded; override;
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procedure Notification(AComponent: TComponent; Operation: TOperation); override;
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procedure SetItemIndex(const Val: integer); override;
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function SQLSafe(aText: string): string;
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procedure UpdateShowing; override;
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public
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{ Public declarations }
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constructor Create(TheComponent: TComponent); override;
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destructor Destroy; override;
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procedure EditingDone; override;
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published
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{ Published declarations }
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property AutoInsert: boolean read FAutoInsert write FAutoInsert;
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property AutoComplete: boolean read FAutoComplete write FAutoComplete default true;
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property AutoCompleteText: TComboBoxAutoCompleteText read GetAutoCompleteText
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write SetAutoCompleteText;
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property ItemHeight;
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property ItemWidth;
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property ListSource: TDataSource read GetListSource write SetListSource;
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property KeyPressInterval: integer read FKeyPressInterval write FKeyPressInterval default 200;
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property RelationName: string read FRelationName write FRelationName;
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property OnAutoInsert: TAutoInsert read FOnAutoInsert write FOnAutoInsert;
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property OnCanAutoInsert: TCanAutoInsert read FOnCanAutoInsert write FOnCanAutoInsert;
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end;
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implementation
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uses IBQuery, LCLType, Variants, LCLProc;
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{ TIBLookupControlLink }
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constructor TIBLookupControlLink.Create(AOwner: TIBLookupComboEditBox);
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begin
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inherited Create;
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FOwner := AOwner;
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end;
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procedure TIBLookupControlLink.UpdateSQL(Sender: TObject);
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begin
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FOwner.UpdateSQL(self,TIBParserDataSet(Sender).Parser)
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end;
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{ TIBLookupComboDataLink }
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procedure TIBLookupComboDataLink.ActiveChanged;
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begin
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FOwner.ActiveChanged(self)
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end;
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procedure TIBLookupComboDataLink.RecordChanged(Field: TField);
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begin
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FOwner.RecordChanged(self,Field);
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end;
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procedure TIBLookupComboDataLink.UpdateData;
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begin
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FOwner.UpdateLinkData(self)
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end;
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constructor TIBLookupComboDataLink.Create(AOwner: TIBLookupComboEditBox);
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begin
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inherited Create;
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FOwner := AOwner
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end;
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{ TIBLookupComboEditBox }
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procedure TIBLookupComboEditBox.HandleTimer(Sender: TObject);
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var ActiveState: boolean;
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begin
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FTimer.Interval := 0;
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FFiltered := Text <> '';
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UpdateList
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end;
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procedure TIBLookupComboEditBox.IBControlLinkChanged;
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begin
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if (ListSource <> nil) and (ListSource.DataSet <> nil) and (ListSource.DataSet is TIBParserDataSet) then
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FIBLookupControlLink.IBDataSet := TIBCustomDataSet(ListSource.DataSet)
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else
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FIBLookupControlLink.IBDataSet := nil;
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end;
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function TIBLookupComboEditBox.GetListSource: TDataSource;
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begin
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Result := inherited ListSource;
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end;
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function TIBLookupComboEditBox.GetRelationNameQualifier: string;
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begin
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if FRelationName <> '' then
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Result := FRelationName + '.'
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else
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Result := ''
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end;
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procedure TIBLookupComboEditBox.ActiveChanged(Sender: TObject);
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begin
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if not FInserting and not FUpdating then
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Application.QueueAsyncCall(@DoActiveChanged,0);
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IBControlLinkChanged;
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end;
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procedure TIBLookupComboEditBox.DoActiveChanged(Data: PtrInt);
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begin
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if AppDestroying in Application.Flags then Exit;
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if (DataSource = nil) and assigned(ListSource) and assigned(ListSource.DataSet)
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and ListSource.DataSet.Active then
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begin
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begin
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if varIsNull(FLastKeyValue) and (ItemIndex = -1) then
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KeyValue := ListSource.DataSet.FieldByName(KeyField).AsVariant
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else
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begin
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KeyValue := FLastKeyValue;
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UpdateData(self); {Force auto scroll}
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if varIsNull(KeyValue) then {Value not present}
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Text := ListSource.DataSet.FieldByName(ListField).AsString
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end;
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end;
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end
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else
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if (DataSource <> nil) and assigned(DataSource.DataSet) and
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(DataSource.DataSet.Active) and (DataField <> '') then
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begin
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ResetParser;
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KeyValue := Field.AsVariant;
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end
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else
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Text := '';
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FOriginalTextValue := Text;
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end;
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function TIBLookupComboEditBox.GetAutoCompleteText: TComboBoxAutoCompleteText;
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begin
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Result := inherited AutoCompleteText;
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if AutoComplete then
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Result := Result + [cbactEnabled]
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end;
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procedure TIBLookupComboEditBox.ResetParser;
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var curKeyValue: variant;
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begin
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if FFiltered then
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begin
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FFiltered := false;
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curKeyValue := KeyValue;
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Text := ''; {Ensure full list}
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UpdateList;
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KeyValue := curKeyValue;
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UpdateData(self); {Force Scroll}
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end;
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end;
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procedure TIBLookupComboEditBox.RecordChanged(Sender: TObject; aField: TField);
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begin
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{Make sure that we are in sync with other data controls}
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if DataSource = nil then
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begin
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KeyValue := ListSource.DataSet.FieldByName(KeyField).AsVariant;
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if VarIsNull(KeyValue) then {Probable deletion}
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begin
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UpdateList;
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KeyValue := ListSource.DataSet.FieldByName(KeyField).AsVariant;
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end;
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end;
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end;
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procedure TIBLookupComboEditBox.SetAutoCompleteText(
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AValue: TComboBoxAutoCompleteText);
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begin
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if AValue <> AutoCompleteText then
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begin
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FAutoComplete := cbactEnabled in AValue;
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inherited AutoCompleteText := AValue - [cbactEnabled]
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end;
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end;
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procedure TIBLookupComboEditBox.SetListSource(AValue: TDataSource);
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begin
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if AValue <> inherited ListSource then
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begin
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FDataLink.DataSource := AValue;
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inherited ListSource := AValue;
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IBControlLinkChanged;
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end;
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end;
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procedure TIBLookupComboEditBox.UpdateList;
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{ Note: Algorithm taken from TCustomComboBox.KeyUp but modified to use the
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ListSource DataSet as the source for the autocomplete text. It also runs
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after a delay rather than immediately on keyup
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}
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var
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iSelStart: Integer; // char position
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sCompleteText, sPrefixText, sResultText: string;
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curText: string;
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begin
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if assigned(ListSource) and assigned(ListSource.DataSet) and (ListSource.DataSet is TIBCustomDataSet)
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and ListSource.DataSet.Active then
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begin
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FUpdating := true;
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try
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iSelStart := SelStart;//Capture original cursor position
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if ((iSelStart < UTF8Length(Text)) and
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(cbactEndOfLineComplete in AutoCompleteText)) then
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Exit;
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curText := Text;
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sPrefixText := UTF8Copy(Text, 1, iSelStart);
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ListSource.DataSet.Active := false;
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ListSource.DataSet.Active := true;
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Text := curText;
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if not FExiting and Focused and (Text <> '')then
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begin
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if ListSource.DataSet.Active and (ListSource.DataSet.RecordCount > 0) then
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begin
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sCompleteText := ListSource.DataSet.FieldByName(ListField).AsString;
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if (sCompleteText <> Text) then
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begin
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sResultText := sCompleteText;
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if ((cbactEndOfLineComplete in AutoCompleteText) and
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(cbactRetainPrefixCase in AutoCompleteText)) then
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begin//Retain Prefix Character cases
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UTF8Delete(sResultText, 1, iSelStart);
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UTF8Insert(sPrefixText, sResultText, 1);
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end;
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Text := sResultText;
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SelStart := iSelStart;
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SelLength := UTF8Length(Text);
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end;
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KeyValue := ListSource.DataSet.FieldByName(KeyField).AsVariant;
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end;
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end;
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finally
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FUpdating := false
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end;
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end;
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end;
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procedure TIBLookupComboEditBox.UpdateSQL(Sender: TObject;
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Parser: TSelectSQLParser);
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var FieldPosition: integer;
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begin
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if FFiltered then
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begin
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if cbactSearchCaseSensitive in AutoCompleteText then
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Parser.Add2WhereClause(GetRelationNameQualifier + '"' + ListField + '" Like ''' +
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SQLSafe(Text) + '%''')
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else
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Parser.Add2WhereClause(GetRelationNameQualifier + 'Upper("' + ListField + '") Like Upper(''' +
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SQLSafe(Text) + '%'')');
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end;
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if cbactSearchAscending in AutoCompleteText then
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begin
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FieldPosition := Parser.GetFieldPosition(ListField);
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if FieldPosition = 0 then Exit;
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Parser.OrderByClause := IntToStr(FieldPosition) + ' ascending';
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end;
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end;
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procedure TIBLookupComboEditBox.HandleEnter(Data: PtrInt);
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begin
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if AppDestroying in Application.Flags then Exit;
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SelectAll
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end;
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procedure TIBLookupComboEditBox.UpdateLinkData(Sender: TObject);
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begin
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if FInserting then
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ListSource.DataSet.FieldByName(ListField).AsString := Text
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end;
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procedure TIBLookupComboEditBox.CheckAndInsert;
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var Accept: boolean;
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NewKeyValue: variant;
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begin
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if AutoInsert and (Text <> '') and assigned(ListSource) and assigned(ListSource.DataSet)
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and ListSource.DataSet.Active and (ListSource.DataSet.RecordCount = 0) then
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try
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{Is it OK to insert a new list member?}
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Accept := true;
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if assigned(FOnCanAutoInsert) then
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OnCanAutoInsert(self,Text,Accept);
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if not Accept then
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begin
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ResetParser;
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Text := FOriginalTextValue;
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SelectAll;
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Exit;
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end;
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412 |
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FInserting := true;
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try
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{New Value}
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FFiltered := false;
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if assigned(FOnAutoInsert) then
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begin
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{In an OnAutoInsert handler, the client is expected to insert the new
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row into the List DataSet and to set the KeyValue property to the
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value of the primary key of the new row.}
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OnAutoInsert(self,Text,NewKeyValue);
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end
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else
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begin
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ListSource.DataSet.Append;
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{The new KeyValue should be determined by an external generator or
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in the "OnInsert" handler. If it is the same as the ListField, then
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it will be set from the UpdateLinkData method}
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try
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ListSource.DataSet.Post;
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except
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ListSource.DataSet.Cancel;
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raise;
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end;
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NewKeyValue := ListSource.DataSet.FieldByName(KeyField).AsVariant;
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end;
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Text := ''; {Ensure full list}
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UpdateList;
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KeyValue := NewKeyValue;
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UpdateData(nil); {Force sync with DataField}
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finally
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FInserting := false
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end;
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except
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Text := FOriginalTextValue;
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ResetParser;
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raise;
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end;
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end;
|
451 |
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procedure TIBLookupComboEditBox.DoEnter;
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begin
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inherited DoEnter;
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FOriginalTextValue:= Text;
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ResetParser;
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Application.QueueAsyncCall(@HandleEnter,0);
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end;
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459 |
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procedure TIBLookupComboEditBox.DoExit;
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begin
|
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if FTimer.Interval <> 0 then
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HandleTimer(nil);
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FExiting := true;
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try
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CheckAndInsert;
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ResetParser;
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FTimer.Interval := 0;
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finally
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FExiting := false;
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end;
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inherited DoExit;
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end;
|
474 |
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procedure TIBLookupComboEditBox.KeyUp(var Key: Word; Shift: TShiftState);
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begin
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477 |
inherited KeyUp(Key, Shift);
|
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if Key = VK_RETURN then
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EditingDone
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else
|
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if Key = VK_ESCAPE then
|
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begin
|
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SelStart := UTF8Length(Text); {Ensure end of line selection}
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ResetParser;
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Text := FOriginalTextValue;
|
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SelectAll;
|
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end
|
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else
|
489 |
if (IsEditableTextKey(Key) or (Key = VK_BACK))
|
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and AutoComplete and (Style <> csDropDownList) and
|
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(not (cbactEndOfLineComplete in AutoCompleteText) or (SelStart = UTF8Length(Text))) then
|
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FTimer.Interval := FKeyPressInterval
|
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else
|
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FTimer.Interval := 0;
|
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end;
|
496 |
|
497 |
procedure TIBLookupComboEditBox.Loaded;
|
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begin
|
499 |
inherited Loaded;
|
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IBControlLinkChanged;
|
501 |
end;
|
502 |
|
503 |
procedure TIBLookupComboEditBox.Notification(AComponent: TComponent;
|
504 |
Operation: TOperation);
|
505 |
begin
|
506 |
inherited Notification(AComponent, Operation);
|
507 |
if (Operation = opRemove) and (AComponent = DataSource) then
|
508 |
ListSource := nil;
|
509 |
end;
|
510 |
|
511 |
procedure TIBLookupComboEditBox.SetItemIndex(const Val: integer);
|
512 |
begin
|
513 |
inherited SetItemIndex(Val);
|
514 |
FLastKeyValue := KeyValue;
|
515 |
end;
|
516 |
|
517 |
function TIBLookupComboEditBox.SQLSafe(aText: string): string;
|
518 |
var I: integer;
|
519 |
begin
|
520 |
Result := '';
|
521 |
for I := 1 to length(aText) do
|
522 |
if aText[I] = '''' then
|
523 |
Result := Result + ''''''
|
524 |
else
|
525 |
Result := Result + aText[I];
|
526 |
end;
|
527 |
|
528 |
procedure TIBLookupComboEditBox.UpdateShowing;
|
529 |
begin
|
530 |
inherited UpdateShowing;
|
531 |
if Showing then {Ensure up-to-date as we were ignoring any changes}
|
532 |
ActiveChanged(nil);
|
533 |
end;
|
534 |
|
535 |
constructor TIBLookupComboEditBox.Create(TheComponent: TComponent);
|
536 |
begin
|
537 |
inherited Create(TheComponent);
|
538 |
FDataLink := TIBLookupComboDataLink.Create(self);
|
539 |
FIBLookupControlLink := TIBLookupControlLink.Create(self);
|
540 |
FKeyPressInterval := 200;
|
541 |
FAutoComplete := true;
|
542 |
FTimer := TTimer.Create(nil);
|
543 |
FTimer.Interval := 0;
|
544 |
FTimer.OnTimer := @HandleTimer;
|
545 |
FLastKeyValue := NULL;
|
546 |
end;
|
547 |
|
548 |
destructor TIBLookupComboEditBox.Destroy;
|
549 |
begin
|
550 |
if assigned(FDataLink) then FDataLink.Free;
|
551 |
if assigned(FIBLookupControlLink) then FIBLookupControlLink.Free;
|
552 |
if assigned(FTimer) then FTimer.Free;
|
553 |
inherited Destroy;
|
554 |
end;
|
555 |
|
556 |
procedure TIBLookupComboEditBox.EditingDone;
|
557 |
begin
|
558 |
CheckAndInsert;
|
559 |
inherited EditingDone;
|
560 |
end;
|
561 |
|
562 |
end.
|